In some situations, the error message can also appear this way:
Event Type: Error Event Source: MSMQ Event Category: (1) Event ID: 2121 Date: Time: User: N/A Computer: 503-UNITY Description: The description for Event ID ( 2121 ) in Source ( MSMQ ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. The following information is part of the event: c00e0075h.
To overcome this problem, add the AlwaysWithoutDS dword registry value under HKLM\SOFTWARE\Microsoft\MSMQ\Parameters\Setup, with a value of 1.
This value is referenced in the W2K Resource Kit Registry Reference. The error occurs on W2K servers that have MSMQ configured in workgroup mode, but the server is actually in a domain. The value of tells MSMQ to remain in workgroup mode.